Well, it first seems like you need your choices inside of a loop, so when you want to repeat, it will actually repeat.
Also, there should be # marks in front of your include statements.
Remove the word "for" from right inside main (or complete a for loop)

I made some minor changes to get it to compile and also some minor cosmetic changes:

I have a 2d matrix with dimension (3, n) called A, I want to calculate the normalization and cross product of two arrays (b,z) (see the code please) for each column (for the first column, then the second one and so on).
the function that I created to find the ...

Write a C program that should create a 10 element array of random integers (0 to 9). The program should total all of the numbers in the odd positions of the array and compare them with the total of the numbers in the even positions of the array and indicate ...